needforspeed: use memcpy for "long" strings; use a better algorithm
for long repeats.
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 6f04a6d..85cbed2 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -5900,11 +5900,18 @@
if (str->length == 1 && len > 0) {
Py_UNICODE_FILL(p, str->str[0], len);
- } else
- while (len-- > 0) {
+ } else {
+ int done = 0; /* number of characters copied this far */
+ if (done < nchars) {
Py_UNICODE_COPY(p, str->str, str->length);
- p += str->length;
- }
+ done = str->length;
+ }
+ while (done < nchars) {
+ int n = (done <= nchars-done) ? done : nchars-done;
+ Py_UNICODE_COPY(p+done, p, n);
+ done += n;
+ }
+ }
return (PyObject*) u;
}